I'll cut to the chase: I have a car that originally had a manifold/downpipe/cat set up that now has a cat-less header welded straight to the midpipe. I need to get it past tailpipe emissions, and without a cat obviously it's failsville.
I'd like to keep the header since it's in good shape and flows a little better.
I was thinking of taking the mid pipe resonator out and welding in a universal cat. In the OEM setup the only O2 is pre-cat and technically it'll have all the proper emissions components, just not in OEM configuration.
I figure I'd tap the GRM community's wealth of knowledge and see if this was a terrible idea.
Might depend on how closely your state follows the inspection rules. Some places will not allow the position of the cats to be changed.
I would call a local exhaust shop and run the idea by them.
I'm not sure how far back you are looking at putting it, but you may have issues getting it hot enough, so I would probably make sure you ran it hot for quite some time before getting it sniffed, just in case?
Each state has different regulations, best to check locally.
yes.. I would think that getting it as close to the header as possible would be best
Check the local regulations, in california you would be putting it back to stock, but other places dont care at all, it just depends.
Talked to a friend in the DMV, Delaware only cares that its in the exhaust system somewhere.
But the location in relation to the header is why I asked here, thanks.
For comparison's sake TT's exhaust mimic's the OEM one pretty well. The midpipe resonator would become the cat.
